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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1e85059f738b784e4a870101b81d64825d46bc0a7f418f7fdc0e4a06b9bbd1' 
  AND token = 'BNbLsi/bQEe2qEll/iOS6tjDhEROtOwa0gdqPT+6HSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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