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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8308ab3046d08fe3e91d04b4850ea8e3978f6f5fb7ca9da4bc371f94576865e' 
  AND token = 'pc3SHBzgJtJONuoKbOGxmyN3vTfUeJzjSnkhvPEM02M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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