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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e21950e184f03400d23bd1de7daedc55da74297ef7ed0787e67e7dd95d18079' 
  AND token = 'HpTx0wra5S5suWebOOrNBiiRRnDzpQld94nfVfz0hUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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