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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b2937f0e82c4676c28fae3acb85774695ceb4a16d0945c482a485c527cde56' 
  AND token = '1qG4i/pKKVHNPgpY68GyxHkNPR0/nlsGQSFq72etahk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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