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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55560a8436ffc24865f4e364027d215507e589d389328f873d743534bae1e804' 
  AND token = '2EfFZHi5WqnGe2sdL+qMUKbSf/Rv7cgrqlyXlvHr1s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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