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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131ffb4498d833887dd9f3a879739c9d9cd729006e64a54280528c1f8faad2c8' 
  AND token = 'eqbsTZFFp/GNIQ8oT5hutYs04NVef7uTlwEftGaAj6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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