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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555d184d0590db6a9bb734818b0ad78c7cd7b8b83b8f7848e55e0380743e9401' 
  AND token = 'W+bbgOOUPEL/peoTHXkdXNzgrtdLKyajE+CUzla1YVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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