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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238b81f7f0f8d03faf9aa0e3f0e670c5a32717bdbb8d530cc644d943c9bdfb57' 
  AND token = 'A3gDTOd1sYNeuSHRfiL5IUP7HMRsIqqdRJpGNq3tYkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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