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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdd21286d51c81f0cd0f953a134f40da339e620b775b58ebaba862d2fc4e88d' 
  AND token = 'ELVH+fDbtJvA0vJPz75Q2sVpF5ci5kjX3kd0aZO43hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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