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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7894063416ebf4e0bee9faa916bc072c546b80fa85d136414577060fef6c13c7' 
  AND token = 'LGDQI88w6JqvcZ5ip4QO5lpooO6UDjRUygkziqKpC7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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