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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dadc481ac95d010142fadcafc57f4de6f6188302431ad6a33cd198a4bdc46f7' 
  AND token = '7boAbAZ11g/ms8jD6XvH5xtQjuTx+iM75nFOgIU6gxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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