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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92128a1213af770a9e14ada60e1936d5258757bb00f5d2bcca0c171c671c6326' 
  AND token = 'wWXhSRFer1MQWoPHZOQ7JQGx25TeLRhSzHVvvhZXtgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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