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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87983ad5c8173b9a62d5c2ff6f82e94e2f7f09801a1c3ae68d07ae2a5bf7c109' 
  AND token = 'AR4W7xFnD02ytxL/tTRJPDEmjmMjSumnoWUoJF5PtVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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