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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94469096a1ee6d56131259a89e0ef2208479ff570ae6d9e3cfacfd7b9c5c43db' 
  AND token = '7B2H+xMBjxhjQ7BfYES+GBA/FlP2/uXgr7t12cXE0zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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