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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd219ff25ed1635cc3e6b1c62749d6b32847ded0a44302e0ba29cc4577d1f2f76' 
  AND token = 'Qx9HzQdwdpIvcBTVlYJObu5kKpxfr5pG2M3lxIG7Q4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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