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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a24fdc7f4e8f601becf1c1214fa95bfed150f8492a978542910a165279d39c' 
  AND token = 'LqxDjOMYueSEjjWcvabWQ+cDr34+mig1AJgmwHu0P84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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