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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e6dae3dbde1c8ccbcdd20f894e05f0f97b6a38105c4dd09bc07a516a650944' 
  AND token = '6xRqvmofOtM8Hrgs+284mV1Mm56ilvS40vbAjaeEpbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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