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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd656bf1a6e7bfcc5e7cb6e11a8f7081587b4b815e585c5639f70bba56745768' 
  AND token = 'Cgw6L0XAMk71kzMhec9xULMgA/7a2bUhAD8T7OUFbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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