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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6535a148d4129e0a1fcf5a25763a6c1730e919822a8d2b423e43f2c9416fa86d' 
  AND token = 'xKelLRerElWANsUq/zMqSXv0EXiqItpHwgyakkgaR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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