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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752c6da1e39108cb82444796197be4833a3ae8a1f341c2d739500a929f56b620' 
  AND token = 'w1lxrwxD5//DYRZ2A/RDjA2os2BQ64PQEdk3oCBM1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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