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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4caeac697a243fd72c62a4a2db0bca43c588849c5272ce5fc6709b1b0465bb85' 
  AND token = 'luNYWq1SBox+sIksI2SblKSvj0zmANCtSaSUAVBLo7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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