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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8087cdacc84ad98f0684ada533ed7220d2ef8e2635fa176c4d5b35e84c13adf' 
  AND token = 'N3PS8hijNpv2rJNFVTBitU4qpuLw9sfhfJj5Y4qproU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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