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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5ccbfd6de5e808c1aafd51089f1445186aef0b7a84be108b99a89be91ecd60' 
  AND token = 'ijk5H9vNM5YqXnYreJCQ5gkC1vv2FnbAxGunASRtbhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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