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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6691cf4574686dbec342133cc9a33912147a476756ce14e1069a694cb67e2f09' 
  AND token = 'oSEWzs8bpQjghID1ENYeBy13yp9P51YC9kzqpvhdTEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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