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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d562d333ba47b09a73f3b4928e79508a1f6da75c67ddce7ad3dc7064f388db' 
  AND token = 'lhsmkd16P/87caDSb6y6WOmCAblnLuUak3zvwdyXq9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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