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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfe496c30a5d5d8bb9450d9ac06f708ad9e58c83759699d969da838e16e4117' 
  AND token = 'dKw3M1yYH29heJ7o0dFTVqD30FdXZIzkKIpPj0m1W4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}