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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bd43a2a2868dbda76a5fddfd08f02393cc7d73562dafe8bdc820c7843b8fb8' 
  AND token = '3Y83qGOncPGECF9o7LW8eLR3RRerMlAOsgkQapDOvN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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