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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ec3a30401ea384b60fdf0ed6c872c68c20ed833847b28046d0e500d4a02eee' 
  AND token = 'X5ZARfNl0Vu336AaOZ7iyjL7JAvS0WsP3R5qpGJKNYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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