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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0942d44795450f2e15d78bfcf149234d02e1fedadead0f19b922da7d9583af80' 
  AND token = '54wAmgZpAIB1xv44CGYjvOycEgNUttCCs+ZjI7/TQaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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