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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f08378f7367c6ee7628bc685a5c60c2a5cc66b05f87ff4601ddd65845e21119' 
  AND token = 'rFBLNOZKON5A6OxugLjLvbvYaxX2iUmE4YuCEuz8bts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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