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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb81a83c0d59fd7e7d67c0c1f023784f0094169617a68f14f89113f106d2b0b' 
  AND token = 'IYa1LQkRWlKiFA/xRONJ+x5HFMMoaMNuewcVCI1frDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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