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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d699ef56f6f83a4c22c1e0be2c70712325f8b0e3cc4147278f9329811f5747b' 
  AND token = 'MkHeisR3RvzYy75xvFPXV8Sy8uzRGrWM2bID8yvK5to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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