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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9a12df462efc5e5f0dc783007559693feb77dce0166079fc9e4c99588997ea' 
  AND token = 'Jn0e95TZ8r7tjhBAtUdEHU2dSWdLuBrQD26WX6VASPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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