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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814bb67917a0de2404990666d7122bf3de99953ce96eb52a4abbd99df4e76dea' 
  AND token = 'w9uArOebRtlPYXGOvB5n72u2ZS9BZKjbIqqbnd7iUqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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