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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b69bcb0e768ebe19e004db0df7ad872c50a048ab4cc2b094d641479fd04dd1' 
  AND token = '33fAFbdPN9CoHXLuDn+l3/MHJwD+YNW9g6grY7I+hpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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