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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c337a0571d6835a87629ec433783288808e94a84ec40c5111dd5fa88567f9c6' 
  AND token = 'bKg+i4YMwlDfD4Vb72GI1fUkX8E9AUOuXoL7PQPFIbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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