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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45f1e49f51438e98de31d4d4482138df35043f6179397a6efec59af76b054d3' 
  AND token = 'MZNOBo+ntl+m5bS5d88hrwBJPMRhbOilXynXGJot6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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