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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e8fd9848c8972cbc7d65e74d6227128268f9cfe722cc9c61e9918d8d49ef6a' 
  AND token = 'tGv5/Hxxn2MUb4lBJ7FxjNkCEZOMj/YG8v/UvW85E2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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