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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796b276214c5aeba7caa2a1e73063b33ac3c70be54ff6d24b5e51f6a1459ee28' 
  AND token = 'p9QPSLFXjm088Pyfog857CTTklsYrZvCJ9jRmENfRXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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