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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068fc6c12e535df6d50b5a3073a298c67c926f1cb8508324889db6cb062dc870' 
  AND token = '4Zv86VBfuAe8ixUIVmALNRavlJjtG4bUs3tZvOv5jsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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