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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de29b24f6b2cb339a7aec45a24ec6c167c5b3dfe592bd1fb398a53bf0e868ae7' 
  AND token = 'vA2kVkSy4IqWS8hksbtZIMZTLVYaNxOONoQxUyHbCXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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