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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3883e05e20150337dc7cd1bf1c7a00ba9d331f652527a5c9f54d7c5f7d8c5b4d' 
  AND token = 'C9hnHloUuh4ECH6exSFZiOlmDvNrA2zPva3fgX53tgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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