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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4256e1e19ad69a44d45392495364f75a9cb394b8b76956c267a277205a04c7' 
  AND token = 'zCL4uIL9QMd6VZ/nWFr7YizVB9AVpS3mri2nBzQlcQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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