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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba46c7d8ca553e723af1421cfd5bec51a909fae915ef61d46e8a94db1d09e7b6' 
  AND token = 'aO4vPMLCiq2UxsFVG300CfNqVAibcNJs+0jLF63RShY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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