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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a499db7d3ff50f443c27442ffd1bf7d831ae1110a68fd8beb869ae7747fe1e7' 
  AND token = 'TGeK6nGo5F/81xNAoTjCuAZjyT3R3dvvViscCcDu1CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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