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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fff384c016e09fe16d058fa7de98e45e0af7946d69de579a31aa5950e56af56' 
  AND token = 'kpgfOh9dcv8Hjl7G2jd2u3dVG+lGu7tBL0zeLo4qLL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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