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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf86722636632025a177359491ea67f77515c7e322afe50645af9360f5e742e' 
  AND token = 'a9IR2saXjpVgU50a+Mr8bW+UTGOgt0CCt2LbKhzWFik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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