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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359c5ccca7d5b95aebf879410ce30aa2937a22038f5d62a3dab3059b326e931c' 
  AND token = 'y8XQq6MPArsNnWpK3sfy0NV8JTr5IcH8KKj2vnIzJqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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