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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4555890b9358f3f0238657da568566bc3b7013ea3a78cce79458bf474e187e' 
  AND token = '/kQWsnZcK/BeAofInJKDVVIcViU3Bl0g1P8SUh2YUa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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