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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0bc6d05d5dcb96fa4b525f94954428030219a4be487e7ad5928978966cbc35' 
  AND token = 'CmB3rdEVej/+/clPc90h7lNa+H2awOtR/+AIUjvr/O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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