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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd9fedb0dc5bfe4217d43ddbb30bb9e6fafd69e5cddb12f44eb50ef514f2fd4' 
  AND token = '4WlcM/U71osLx7Gz3n8X69x0T5ge6fC2rgtIP4ndcnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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